can a waveport provide a pulsed waveform in ansoft HFSS?? How??

I want to give a pulsed electromagnetic wave to a dielectric substrate, is it possible to do this using the waveport??

I basically need to provide different types of waveforms to a dielectric and then see how the dielectric behaves. I must be able to set the amplitude and frequency of the waveform?? For this, what do I use??? must i use a waveport or is there some other option???